Discussion on the validity of the Permian as a system.
British Association for the Advancement of Science.Meeting(1930 :Bristol, England)
London : British Association for the Advancement of Science,
[1930]
Cover title.
"The following communications were among those presented at the Annual Meeting of the Association in Bristol, September 3-10, 1930, and is [sic] reprinted from the Report of that meeting"--verso of title page.
At head of each page: "Sectional transactions.-C".
Includes bibliographical references.
Geology, Stratigraphic